The correct choices are (B) inventiveness and (D) inherent structure.

The Logic Breakdown
Blank (i): The sentence pairs this blank with "virtuosity." Virtuosity refers to great technical skill. We need a word that complements the active, skillful nature of a jazz player.
- Controlled playing (A) might seem plausible, but jazz is famous for its freedom.
- Emotional distance ( $\mathbf{C}$ ) is the opposite of the high-energy, engaged nature of jazz performance.
- Inventiveness (B) perfectly complements virtuosity; a jazz player must be both technically skilled and creative (improvisational) on the fly.

Blank (ii): The clue for this blank comes after the semicolon: the music is described as an "apparently amorphous flow" that lacks "musical stability." * Underlying rhythm (E): Jazz actually has very strong, complex rhythms, so it doesn't "lack" rhythm.
- Controlled emotions (F): This doesn't address the "amorphous" or "unstable" nature of the music's shape.
- Inherent structure (D): If something is "amorphous" (shapeless) and "unstable," it appears to lack a pre-defined or inherent structure.

The "Apparently" Pivot
The word "apparently" is crucial. It suggests that while the music seems amorphous to those with "traditional expectations," it likely does have a structure that they simply haven't learned to recognize yet. The "inventiveness" (improvisation) of the performer is what makes the "structure" harder to find for a novice.

Why the others fail:
The pair (B) and (D) creates a cohesive logical narrative: Because jazz players are so inventive (improvising constantly), the music seems to wander without a plan, leading outsiders to think it lacks structure.